Infinity and Cold mastery. Which is applied first?

CM will lower an enenmies res to 0% and conviction will lower a monsters res as much as it can. But if conviction is applied first CM is totally worthless. I can't imagine that is the case (but immnuites make me question that) so tomorrow when I equip my Infinity on my merc can I look forward to monsters all having -85 res?

Ok, this is how it works. Only Lower Resist and Conviction can break enemy elemental resistances. LR lowers (or breaks, but when breaking, is reduced to 1/5 effectiveness) all elemental resistances, whereas Conviction lowers (or breaks, again at 1/5 effectiveness) only fire, cold and lightning. So when facing immunes, the Conviction on your Infinity will work at -85/5 = -17 at breaking elemental immunes.

CM cannot break CIs. However, if the CI is broken by either LR, Conviction, or both working together (if working together, add the two values and divide by 5), then CM comes into play. In other words, break first, and if successfully broken, CM is applied to whatever the value of - enemy cold resistance you currently have. CM has a cap of lowering to -100% enemy cold resistance, which is why slvl 17 CM (-100%) is the optimal target for 0% cold resistance monsters.

Note that the majority of CI monsters have over-stacked cold resistance, so even a combo of LR and Conviction cannot break them. And if they remain CI, then CM is worthless against them. Also note that the -100% to enemy resistances cap applies across the board, regardless of whether you are using LR or Conviction.

Ok, this is how it works. Only Lower Resist and Conviction can break enemy elemental resistances. LR lowers (or breaks, but when breaking, is reduced to 1/5 effectiveness) all elemental resistances, whereas Conviction lowers (or breaks, again at 1/5 effectiveness) only fire, cold and lightning. So when facing immunes, the Conviction on your Infinity will work at -85/5 = -17 at breaking elemental immunes.

CM cannot break CIs. However, if the CI is broken by either LR, Conviction, or both working together (if working together, add the two values and divide by 5), then CM comes into play. In other words, break first, and if successfully broken, CM is applied to whatever the value of - enemy cold resistance you currently have. CM has a cap of lowering to -100% enemy cold resistance, which is why slvl 17 CM (-100%) is the optimal target for 0% cold resistance monsters.

Note that the majority of CI monsters have over-stacked cold resistance, so even a combo of LR and Conviction cannot break them. And if they remain CI, then CM is worthless against them. Also note that the -100% to enemy resistances cap applies across the board, regardless of whether you are using LR or Conviction.

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I guess this answer should be stickied since IÂ´m getting bored reading same topics over and over (asking whether infi works good with cold sorks and so)

This is a pretty common question (and the answer is always the same.) Where would you look to find it stickied though? Other than indicating it in the various builds I don't know where people would ever go to look it up. It's one of those all purpose dii questions.